Gas turbine combustor

Abstract

A combustor inner cylinder is disposed inside a combustor outer casing, and a spread flame formation cone and a plurality of premixed flame-formation nozzles are provided inside the combustor inner cylinder. The premixed flame-formation nozzles have sector-shaped outlets and disposed annularly between the combustor inner cylinder and the spread flame formation cone which forms spread combustion flames. Part of the air from a compressor is passed through clearances between the premixed flame-formation nozzles as cooled air and discharged toward a combustion chamber.

What is claimed is:  
     
       1. A gas turbine combustor comprising: 
       a combustor inner cylinder;  
       a spread flame formation cone, disposed inside said combustor inner cylinder, which forms spread flames by mixing pilot fuel with air; and  
       a plurality of premixed flame-formation nozzles which form premixed flames out of premixed gas formed by mixing main fuel with the air and which are disposed annularly between said combustor inner cylinder and said spread flame formation cone, wherein,  
       nozzle outlets of said premixed flame-formation nozzles are shaped so that clearances between outer peripheries of said premixed flame-formation nozzles adjacent each other have same dimension at said nozzle outlets,  
       wherein the clearances between the outer peripheries of said premixed flame-formation nozzles are generally linear at said nozzle outlets.  
     
     
       2. The gas turbine combustor according to  claim 1 , wherein one or more of the clearances between outer peripheries of said nozzle outlets of said premixed flame-formation nozzles and an inner periphery of an outlet of said combustor inner cylinder, and the clearances between the outer peripheries of said nozzle outlets of said premixed flame-formation nozzles and an outer periphery of an outlet of said spread flame formation cone have same dimensions.